Update golang.org/x/sync digest to f12130a

This MR contains the following updates:

Package	Type	Update	Change
golang.org/x/sync	require	digest	886fb93 -> f12130a

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go.mod

@@ -7,5 +7,5 @@ require (
 	github.com/jhillyerd/enmime v0.10.0
 	github.com/oschwald/geoip2-golang v1.5.0
 	github.com/prometheus/client_golang v1.11.0
-	golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4
+	golang.org/x/sync v0.0.0-20220907140024-f12130a52804
 )